you need to make sure you have the double filament bulb (4057) in each socket. I know it sounds dumb but I went thru this issue when I installed my sequential kit (Drake IIRC). All of the bulbs worked in the stock harness but wouldn't work in the sequential. went and got new bulbs and things have worked since 2014, no issues. Also, the inside lights only work for turn signal and park/driving, the outer 2 go bright for brake. SJB as said above controls the brake lights so if you are having issues it might be time to take a look at that and clean it up. good luck